# $$\large{X- rays}$$

An X-ray tube is working at a potential difference of $$38.08~kV$$. The potential difference is decreased to half its initial value. It is found that difference of the wavelength of $$K_{\alpha}~X-ray$$ and the most energetic continuous $$X-rays$$ become 4 times of the difference prior to the change of voltage. Assuming $$K_{\alpha}$$ line is present in both cases, then find the atomic number of the target element

×